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Problem 11

Which of these processes are spontaneous? (a) A s…


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Problem 10

Which of these processes are spontaneous? (a) Methane burns in air. (b) A teaspoonful of sugar dissolves in a cup of hot coffee. (c) A soft-boiled egg becomes raw.

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Video Transcript

Chapter 20 problems. Ethan is discussing which processes are spontaneous, so let's think about the process of methane. Here's a formula for methane, the compassion of methane. An air involved th floor plus two oxygen at molecules, and it creates water and carbon dioxide. This is also an XO thermic reaction, so it creates heat. So the system of this reaction creates heat, so it releases energy from that system into the surroundings. That energy into the surroundings increases the degree of particle motion and particle movement. Therefore, this process is spontaneous. Let's think about it. We had a cup, and in that cup we had hot coffee. And then we put sugar into that cup and that sugar was in that hot coffee. What naturally happens is that sugar dissolves. That sugar is gonna move around until it fills up the entire space of the coffee. I have to start a little bit, but it's gonna plead Jews off doing at that point. Every time you drink the coffee, it'll taste. The same amount of sweetness is the next time, because the sugar's all dispersed throughout. This increases the degree of the particle movement of the sugar molecules. More soul than when it was in its solid state, just the, um, as a cube or as a in a teaspoon packet. So when you have the increased freedom of particles here, the way it is with sugar and hot coffee, it is also a spontaneous reaction or spontaneous change. Last of this. Think of it an egg. You've had a boiled egg before when you boil that egg, the proteins in that molecule de nature and it forms a solid inside the show. So in this case you have a softball egg, and previously it was raw, changing it from raw too solid and then going back from solid to raw. If you think about those two options going from a solid boiled egg to a rock, A is not likely to happen at all, even applying energy to that. So that process is not a spontaneous reaction. So the combustion of methane, as well as the dissolving of sugar and hot coffee, are both spontaneous reactions but not going from a soft boiled egg toe awry.

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